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3 / 48 page 2001 Apr 12 3 Philips Semiconductors Product specification New In Car Entertainment (NICE) car radio TEA6845AH; TEA6845H 1 FEATURES • FM mixer for conversion of FM RF from 65 to 108 MHz to IF of 10.7 MHz; the mixer provides inherent image rejection • FM RF mixer can be set to receive weather band radio up to 162.55 MHz; weather band radio flag output • AM mixer 1 for conversion of AM RF to AM IF1 of 10.7 MHz • LC tuner oscillator providing mixer frequencies for FM mixer and AM mixer 1 • AM mixer 2 for conversion of AM IF1 to AM IF2 of 450 kHz • Crystal oscillator providing mixer frequencies for AM mixer 2 and reference for synthesizer PLL, IF count, timing for Radio Data System (RDS) update and reference frequency for car audio signal processor ICs • Fast synthesizer PLL tuning system with local control for inaudible RDS updating • Timing function for RDS update algorithm and control signal output for car audio signal processor ICs (TEA688x, SAA77xx) or car radio integrated signal processor IC (TEF6890H) • Digital auto alignment circuit for conversion of LC oscillator tuning voltage to controlled alignment voltage of FM antenna tank circuit • AGC PIN diode drive circuit for FM RF AGC; AGC detection at FM mixer input; the AGC PIN diode drive can be activated by the I2C-bus as a local or distance function; AGC threshold is a programmable and keyed function switchable via the I2C-bus • FM IF linear amplifiers with high dynamic input range • FM quadrature demodulator with automatic centre frequency adjustment and Total Harmonic Distortion (THD) compensation • Level detector for AM and FM with temperature compensated output voltage; starting point and slope of level output is programmable via the I2C-bus • AM RF PIN diode drive circuit; AGC threshold detection at AM mixer 1 and IF2 AGC input; threshold is programmable via the I2C-bus; AM IF2 AGC and demodulator • AM AF output switchable to provide AM IF2 for AM stereo decoder • AM noise blanker with blanking at AM IF2 • Several test modes available for fast IC and system tests. 2 GENERAL DESCRIPTION The TEA6845 is a single IC with car radio tuner for AM and FM intended for microcontroller tuning with the I2C-bus. It provides the following functions: • AM double conversion receiver for LW, MW and SW (31 m, 41 m and 49 m bands) with IF1 = 10.7 MHz and IF2 = 450 kHz • FM single conversion receiver with integrated image rejection for IF = 10.7 MHz capable of selecting US FM, US weather, Europe FM, East Europe FM and Japan FM bands. 3 ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TEA6845AH QFP64 plastic quad flat package; 64 leads (lead length 1.95 mm); body 14 × 20 × 2.8 mm SOT319-5 TEA6845H QFP64 plastic quad flat package; 64 leads (lead length 1.95 mm); body 14 × 20 × 2.8 mm SOT319-2 |
Số phần tương tự - TEA6845H |
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Mô tả tương tự - TEA6845H |
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